diff --git a/.claude/skills/replay-eval/scripts/claude_runtime.py b/.claude/skills/replay-eval/scripts/claude_runtime.py
index bd4e6ae..ba5daaf 100644
--- a/.claude/skills/replay-eval/scripts/claude_runtime.py
+++ b/.claude/skills/replay-eval/scripts/claude_runtime.py
@@ -45,7 +45,9 @@ ENVIRONMENT_ALLOWLIST = frozenset(
 )
 AUTHENTICATION_FIELDS = frozenset({"ANTHROPIC_API_KEY", "CLAUDE_CODE_OAUTH_TOKEN"})
 HASH_PATTERN = re.compile(r"^(?:sha256:)?[0-9a-f]{64}$")
-MODEL_ID_PATTERN = re.compile(r"^[A-Za-z0-9][A-Za-z0-9._:-]{5,127}$")
+MODEL_ID_PATTERN = re.compile(
+    r"^(?=.{6,128}$)[A-Za-z0-9][A-Za-z0-9._:-]{5,127}(?:\[[A-Za-z0-9._:-]+\])?$"
+)
 MONEY_QUANTUM = Decimal("0.000001")
 
 
diff --git a/.claude/skills/replay-eval/scripts/test_claude_runtime.py b/.claude/skills/replay-eval/scripts/test_claude_runtime.py
index f81d47e..384cc28 100644
--- a/.claude/skills/replay-eval/scripts/test_claude_runtime.py
+++ b/.claude/skills/replay-eval/scripts/test_claude_runtime.py
@@ -29,6 +29,7 @@ from claude_runtime import (  # noqa: E402
 
 
 FULL_MODEL_ID = "claude-opus-4-1-20250805"
+CAPABILITY_MODEL_ID = "claude-opus-4-8[1m]"
 OUTPUT_SCHEMA = {
     "type": "object",
     "additionalProperties": False,
@@ -38,7 +39,12 @@ OUTPUT_SCHEMA = {
 SYSTEM_PROMPT = "只返回符合给定 JSON Schema 的测试对象。"
 
 
-def execution_profile(executable: str = "/usr/bin/true") -> ExecutionProfile:
+def execution_profile(
+    executable: str = "/usr/bin/true",
+    *,
+    model_alias: str = "opus",
+    resolved_model_id: str = FULL_MODEL_ID,
+) -> ExecutionProfile:
     """构造不依赖真实模型、但字段完整的冻结测试 profile。"""
 
     executable_hash = hashlib.sha256(pathlib.Path(executable).read_bytes()).hexdigest()
@@ -48,8 +54,8 @@ def execution_profile(executable: str = "/usr/bin/true") -> ExecutionProfile:
         claude_executable_path=executable,
         claude_executable_sha256=executable_hash,
         claude_cli_version="2.1.211",
-        model_alias="opus",
-        resolved_model_id=FULL_MODEL_ID,
+        model_alias=model_alias,
+        resolved_model_id=resolved_model_id,
         effort="high",
         max_budget_usd_per_call=Decimal("1.500000"),
         timeout_seconds=30,
@@ -114,6 +120,49 @@ def runner_for(envelope: dict[str, object], *, returncode: int = 0, stderr: str
 class ClaudeRuntimeTest(unittest.TestCase):
     """验证统一 runtime 的成功条件与失败优先级。"""
 
+    def test_profile_accepts_exact_model_id_with_capability_suffix(self):
+        """真实 modelUsage 的方括号能力后缀必须能构造冻结 profile。"""
+
+        profile = execution_profile(resolved_model_id=CAPABILITY_MODEL_ID)
+
+        self.assertEqual(profile.resolved_model_id, CAPABILITY_MODEL_ID)
+
+    def test_model_id_capability_suffix_is_narrow_and_terminal(self):
+        """能力后缀只能是末尾单个非空安全字符集合。"""
+
+        invalid_model_ids = (
+            "claude-opus-4-8[]",
+            "claude-opus-4-8[[1m]]",
+            "claude-opus-4-8[1m[2m]",
+            "claude-opus-4-8[1m/2m]",
+            "claude-opus-4-8[1m]suffix",
+            "claude-opus-4-8[1m][2m]",
+        )
+        for model_id in invalid_model_ids:
+            with self.subTest(model_id=model_id), self.assertRaises(ValueError):
+                execution_profile(resolved_model_id=model_id)
+
+    def test_model_id_length_includes_capability_suffix(self):
+        """方括号后缀计入模型 ID 的 6 到 128 字符总长度。"""
+
+        max_length_model_id = "a" * 125 + "[x]"
+        over_max_length_model_id = "a" * 126 + "[x]"
+
+        profile = execution_profile(resolved_model_id=max_length_model_id)
+        self.assertEqual(len(profile.resolved_model_id), 128)
+
+        with self.assertRaises(ValueError):
+            execution_profile(resolved_model_id=over_max_length_model_id)
+
+    def test_capability_suffix_does_not_bypass_alias_rejection(self):
+        """方括号后缀不能让 alias 与 resolved model ID 相等的 profile 通过。"""
+
+        with self.assertRaises(ValueError):
+            execution_profile(
+                model_alias=CAPABILITY_MODEL_ID,
+                resolved_model_id=CAPABILITY_MODEL_ID,
+            )
+
     def test_success_uses_structured_output_and_emits_complete_receipt(self):
         """成功必须返回 structured_output，并形成不含正文的完整回执。"""